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New Interpretation for an Old Oil Field: Structural Study of the Milroy Field
Robert Harmon, Master’s Candidate, Geosciences

The purpose of this geologic study is to compare two different, structural cross-section models to determine which model best fits the designated field area. Both models will use the same thirteen wells chosen by F. P. Schweers in his article published in 1959. Schweer’s cross-sectional model looked at the subsurface according to his interpretation of the structural features seen, which was to mold the cross-section into a “rabbit-ear” anticline model. Our “best fit” model of the cross-section is a backthrust feature into the Ardmore Basin as a result of inversion in the Arbuckle Mountains.

In order to choose the model of “best fit,” the method known as “balancing cross-sections” will be utilized. Several models have been proposed for structures in and adjoining the Arbuckle Uplift but to date no balanced sections of smaller features, such as those seen in the Milroy field, have been presented.

In this research project we apply the line-length balance method to prepare balanced cross-sections of the structural features seen in both cross-sections in the Milroy Field. The Milroy Field is a small, Southern Oklahoma reservoir that runs from Southeastern Stephens County into Northwestern Carter County. The cross-section used in this project begins in Stephens County, Section 23-T2S-R4W, continues into Section 24-T2S-R4W, and ends in Carter County, Section 18-T2S-R3W.